Allen-Bradley

1756-IR12 | Allen-Bradley ControlLogix 12-Channel RTD Input Module

Model 1756-IR12
Type I/O Modules
Condition In Stock

Allen-Bradley

I/O Modules

4.6/5 (16 reviews)

$220.00 Indicative price · request a quote for availability

Allen-Bradley 1756-IR12 ControlLogix analog input module with 12 non-isolated 3-wire RTD channels, 24-bit resolution, and multiple Ohm input ranges.

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Product Description

Product Overview

When temperature accuracy stalls production, the 1756-IR12 from Allen-Bradley delivers reliable RTD measurement for ControlLogix systems. This analog input module packs 12 non-isolated channels into a single chassis slot, giving you dense temperature sensing without expanding your footprint. Part of the Bulletin 1756 line, it handles general-purpose I/O with 24-bit resolution and a Sigma-Delta conversion method.

Figure 1: Front view of the Allen-Bradley 1756-IR12 industrial automation component showing its physical design and enclosure.

Technical Specifications

Specification	Value
Module Type	Analog input, 3-wire RTD
Channels	12, non-isolated
Resolution	24-bit
Input Ranges	1–500, 2–1000, 4–2000, 8–4000 Ohms
Isolation Voltage	250 V continuous
Current Draw at 5.1 VDC	200 mA (Series A), 210 mA (Series B)
Current Draw at 24 VDC	70 mA
Backplane Power	2.7 W (Series A), 2.75 W (Series B)
Operating Temperature	0 to 60 °C (32 to 140 °F)
Scan Time	50 ms minimum
Data Format	IEEE 32-bit floating point
Overvoltage Protection	±30 VDC

What These Specs Mean in Practice

The 24-bit resolution translates to precise temperature readings, critical when processes demand tight control. With four Ohm ranges, you can match platinum, nickel, or copper RTD sensors without swapping hardware. The 250 V continuous isolation protects your backplane from field surges, while the 50 ms scan time keeps your control loop responsive.

Where the 1756-IR12 Fits

Oil and gas operations rely on accurate temperature data for heat exchangers, compressor monitoring, and pipeline custody transfer. The 1756-IR12 handles these applications with 12 channels per module, reducing card count and cabinet space. Food processing and pharmaceutical plants also benefit from its 3-wire RTD support, which compensates for lead resistance in long cable runs.

Figure 2: Technical layout and connection details for the Allen-Bradley 1756-IR12 industrial automation component.

Integration and Compatibility

The module mounts directly in a ControlLogix chassis and communicates over the backplane. It supports software-configurable electronic keying and mechanical RTB keying. Compatible removable terminal blocks include the 1756-TBCH and 1756-TBS6H. For wiring into your existing ControlLogix network, confirm cable and terminal block requirements with your supplier.

Maintenance and Reliability

RTD input modules have no moving parts, so wear is minimal. Focus on environmental factors: keep cabinet temperature within the 0 to 60 °C range and protect against moisture. Periodically inspect terminal connections for corrosion or looseness. The status LED provides quick health indication. For safety-related applications, follow the manufacturer’s safety manual and inspect periodically.

Selection Checklist

Before ordering the 1756-IR12, verify your sensor type (RTD vs. thermocouple), required input range, and chassis slot availability. Confirm your ControlLogix firmware revision supports this module. If you need spares when you need them, Oil AutoTech offers fast dispatch, worldwide. Contact Oil AutoTech today for pricing and availability.

Please verify current lifecycle status and availability with Oil AutoTech before ordering.

Specifications

Model / No.	1756-IR12
Product Type	I/O Modules
Brand	Allen-Bradley
Condition	In Stock
Origin	US
Warranty	12 Month
Price	$220.00

Additional Information

The 1756-IR12 ControlLogix analog input module features 12 channels in the 3-wire RTD mode and it is used as a general-purpose I/O device. The component is made by Allen-Bradley/Rockwell Automation and it is part of the Bulletin 1756 product line. The module has a 24-bit resolution and input that includes 1 to 500, 2 to 1000, 4 to 2000, and 8 to 4000 Ohms ranges. Technical specifications for 1756-IR12
Brand Allen-Bradley / Rockwell Automation
Series ControlLogix
Part Number 1756-IR12
Application General purpose I/O
Module type Analog input, 3-wire RTD connections
Number of channels 12, non-isolated
Data resolution 24-bit
Mounting Chassis
Display Status LED
Input/output range 1 to 500/2 to 1000/4 to 2000/8 to 4000 Ohms
Isolation voltage 250 Volts (continuous)
Current draw at 5.1 Volts DC 200 milli Amps
Current draw at 24 Volts DC 150 milli Amps
Operating temperature 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit)
UPC 887172654879
UNSPSC 32151705 Description
The analog input module that is known as the 1756-IR12 module has been designed by Allen-Bradley/Rockwell Automation and it is made for general-purpose applications and it has a variety of features in order to meet different requirements. The module has features like a notch filter, different module input ranges, a digital filter, a detection feature for under-range/over-range situations, sensor offset, wire off detection, and different sensor types. The 1756-IR12 module provides different input ranges for different sensor types and has the ability to automatically select the last used range-sensor configuration. The unit is part of the Bulletin 1756/ControlLogix product family which offers several other input modules with specifications geared to meet the demands of different applications in industrial environments.

The 1756-IR12 analog input module supports 3-wire RTD connections and it has 12 analog non-isolated channels. The module features 24-bit resolution and a status LED display. The module provides the following input/output ranges: 1 to 500, 2 to 1000, 4 to 2000, and 8 to 4000 Ohms. The 1756-IR12 module has a current draw of 200 milliAmps at 5.1 Volts and one of 70 milliAmps at 24 Volts. This component dissipates up to 2.7 Watts of power and it has a thermal dissipation of 9.2 BTU per hour. The module features overvoltage protection of up to +/- 30 Volts DC and it has a channel bandwidth that is dependent on the notch filter configuration. The 1756-IR12 input module has a continuous insolation voltage of 250 Volts and it features a reinforced insulation type. In addition to that, the unit mounts on a chassis and it has an operating temperature of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit).The Allen-Bradley 1756-IR12 module is a ControlLogix series high-resolution input module with 12 inputs. It is also known as an RTD input module or temperature-sensing module because it can be used for temperature-sensing applications. The 1756-IR12 input module has a T4 temperature code rating. It supports software-configurable electronic module keying and mechanical RTB keying which is user-defined. The 1756-IR12 input module is compatible with a variety of removable terminal blocks in the Allen-Bradley Bulletin 1756 product line, including the 1756-TBCH and the 1756-TBS6H removable terminal blocks. The 1756-IR12 input module uses a Sigma-Delta module conversion method. Its minimum rated module input scan time is 50 ms. The data format that the 1756-IR12 module uses is the IEEE 32-bit floating point data format. When the users calibrate the 1756-IR12 input module, they can calibrate it to operate with RTD inputs (Ohms) or with thermocouple inputs (millivolts). In the RTD mode, the 1756-IR12 input module can support input ranges of 1 to 500 Ohms, 2 to 1000 Ohms, 4 to 2000 Ohms, and 8 to 4000 Ohms. This module supports different types of RTD sensors, including different types of platinum, nickel, and copper sensors. The 1756-IR12 input module’s current draw rating at 5.1 Volts DC is 200 mA for a Series A module and 210 mA for a Series B module. Its current draw rating at 24V DC is 70 mA for both Series A and Series B modules. Its total backplane power rating is 2.7 W for a Series A module and 2.75 W for a Series B module. The 1756-IR12 input module’s operating temperature range is 0 to 60 degrees Celsius.

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Shipping & Returns

Shipping Port: Xiamen
Shipping Details: Ships within 1-3 business days after payment via DHL / FedEx / UPS Express, or by sea/air freight for bulk orders. Tracking number is provided the same day the parcel leaves our warehouse.
Return Policy: 30-day return for unused items in original packaging. All parts are covered by a 12-month warranty against defects; DOA units are replaced free of charge.